Hi James,
There is a Replay function (see the Modes menu), although I haven't used it and am not sure how it works. I imagine you'd need to start a new replay for each PBEM turn.
I keep notes as I play (check the AAR section for La Grande Armée), and I will generally write up some observations and thoughts. I also like to examine how my opponent played and how I might have played differently if we had switched sides.
And of course, just talking with my opponents as we wrap up a scenario to "debrief" and share observations is a good way too.
Another option could be to record your screen using OBS (
https://obsproject.com/) and review the video footage for your turns.
Steve
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Sous-Lieutenant Steve Simenic
1ère Compagnie du 8ème Régiment d'Artillerie à Pied,
Artillerie Divisionnaire,
1ère Division,
I Corps d'Armée.
Games owned: All except Jena-Auerstedt and Napoleon's Russian Campaign